Petrogenesis of the Llano Granites, Central Texas. Elizabeth Roller December 3, 2002. Topics to be Covered. Geologic setting Why do we care? Creating a map Creating a dataset Problems encountered Further work. Tectonic Setting. Grenville Orogeny - ~1.2.-1.1 Ga
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December 3, 2002
From Patchett and Ruiz, 1989
From Mosher, 1998
Granites in the Llano Uplift
From Reed, 1999
Unoriented CAD drawing with very nice layers and fault lines and full coverage
Oriented raster file with no layers and only half coverage
Two point transformation utilizing two points where the coordinates were known on both the CAD drawing and the raster file.
Existing geochemical data
Existing isotopic data, including U-Pb dates
Geospatial DataCreating a Dataset
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This was accomplished by exporting an excel file to a .dbf file, and then using the display X-Y data function.
Graph of the distribution of the Rare Earth Elements within one of the types of granites